Polymerized bituminous, premolded, expansion joint



Patented Nov. 27, 1934 UNITED STATES POLYLIERIZED BITUIVHNOUS, PREMOLDED,

EXPANSION JOINT Albert C. Fischer,

Chicago, Ill., assignor to The Philip Carey Manufacturing Company, a corporation of Ohio No Drawing. Application Serial No.

2 Claims.

In the art it has been the practice to use ordinary asphaltic or bituminous materials in the preparation of expansion joints, and in many of these cases, finely divided, saturated fibrous, material. Asphalts of various kinds, except at a very low melting point and very high penetration, at 32 F. become very brittle in winter, and the shock often breaks this material leaving the joint in a manner to destroy its efficiency.

This invention relates to a treatment of the bituminous material with a polymerized oil, in order to add to the life of the asphalt or bituminous material and at the same time make the material more elastic. This may be accomplished by introducing an oil that will polymerize readily at a high hea for instance, China-wood oil, which, when heated to 500, sets to a jellylike mass. By retarding this heating this mass may be produced in a stringy consistency.

The salient feature of my invention consists in either mixing polymerized oil with the asphalt or else mixing unpolymerized oil with the asphalt and subjecting the mixture to a temperature sufficient to polymerize the oil in the mix. By varying the temperature above the degree necessary to polymerize the oil I am enabled to obtain various results.

Another effect upon this bituminous material would be to control its penetrating power, reducing it to a minimum, thus making it easy to incorporate cellular, fibrous material, such as, cocoanut fibre, sissal, flat fibrous vegetable matter, bristles, flax, bagasse, straw, or any other material suitable as a binder, which is to be incorporated and mixed in a manner so that the bituminous material will not penetrate the fibre.

This combination of materials may be effected by polymerized China-wood oil, employing varying proportions of the polymerized oil, one formula being five (5) per cent polymerized oil and ninety-five (95) per cent of suitable bituminous material, or varying proportions, increasing the proportion of polymerized oil and decreasing the December 21, 1925, 76,904

proportion of bituminous material, depending upon the consistency of the mass desired. Where it is desirable to incorporate any of the fibrous material mentioned, percentages varying from three to twenty-five per cent may be readily incorporated with mechanical mixers, known to the art. A combination of material which has'been found to produce a very satisfactory expansion joint consists in a mixture of five (5) per cent polymerized China-Wood oil, eighty-five (85) per cent bituminous material and ten (10) per cent finely divided material.

I do not wish to be limited to the type of oil, as other vegetable oils than China-wood oil may be employed, such as, cotton-seed oil, and by the addition of dryers in the oil, or theintroduction of sulphur, the polymerization may be somewhat hastened. v

Neither do I wish to be limited to thefibrous matter mentioned, as many other types of fibrous matter may be suitable. Also finely divided matter may be employed, if it is desirable that the entire mass be waterproofed. The resulting product is one of an elastic nature and one which will prolong the life of the asphalt or bituminous material, and at the same time strengthen the binding material resulting from the mixture.

After mixing this material, as outlined, in any suitable mechanical mixer, it may be presented to pressing rolls, also previously known to the art, suitable for reducing the batch to flat sheets, then cutting said sheets into strips, adapting the material for use as premolded expansion joints.

I claim:

1. A premolded expansion joint consisting of 9a a mixture of five (5) per cent polymerized Chinawood oil, eighty-five (85) per cent bituminous material and ten (10) per cent finely divided material.

2. A premolded expansion joint comprising a 95 mixture of polymerized China-wood oil, bituminous material and finely divided filling material.

ALBERT C. FISCHER. 

